| Autor: |
Hatakeyama S; Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Mino S; Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Mizobata M; Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Takada M; Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan.; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan.; Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan., Tsuchiya J; Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Yamaki S; Laboratory of Marine Food Science and Technology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Ando Y; Laboratory of Marine Bioresources Chemistry, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Sawabe T; Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan., Takai K; Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science & Technology (JAMSTEC), Yokosuka, Japan. |
| Abstrakt: |
A novel mesophilic bacterium, strain SS33 T , was isolated from a deep-sea hydrothermal vent chimney at Suiyo Seamount, Izu-Bonin Arc, Western Pacific Ocean. The cells of strain SS33 T were motile short rods with a single polar flagellum. The growth of strain SS33 T was observed at the temperature range between 33 and 55 °C (optimum growth at 45 °C), at the pH range between 5.0 and 7.1 (optimum growth at pH 6.0) and in the presence of between 2.0 and 4.5% (w/v) NaCl [optimum growth at 3.5% (w/v)]. Strain SS33 T was a facultative anaerobic chemolithoautotroph using molecular hydrogen and elemental sulphur as the sole electron donor. Nitrate, nitrous oxide, sulphate, elemental sulphur and molecular oxygen were capable of serving as the sole electron acceptor. Phylogenetic analysis based on 16S rRNA gene sequences placed strain SS33 T in the genus Hydrogenimonas belonging to the class Epsilonproteobacteria . The closely related species of strain SS33 T were Hydrogenimonas urashimensis SSM-Sur55 T (95.96%), Hydrogenimonas thermophila EP1-55-1% T (95.75%) and Hydrogenimonas cancrithermarum ISO32 T (95.24%). According to the taxonomic and physiological characteristics, it is proposed that strain SS33 T was classified into a novel species of genus Hydrogenimonas , Hydrogenimonas leucolamina sp. nov., with SS33 T (=JCM 39184 T =KCTC 25253 T ) as the type strain. Furthermore, the genome comparison of Epsilonproteobacteria revealed that their [NiFe] hydrogenase genes belonging to Group 1b could be divided into two phylogenetic lineages and suggested that the reverse gyrase gene has been lost after division to the genus Hydrogenimonas . |
